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Updated: August 21, 2026
Coal is King. Hewette. Economical Burning of Coal Without Smoke. Bement. Coal and Coal Mines. H. Green. International Library of Technology. Vols. 37 and 38. Reports of Geological Survey. Report National Conservation Commission. Conservation of Mineral Resources. Production of Coals in the U. S. in 1908. Advance chapters available.
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